James f



mine: COATING R PLASTIC.

UNITED STATES PATENT OFFICE.

JAMES F. MUNSIE, OF BROOKLYN, ASSIGNOR TO THOMAS L. COLES, OF NEIV YORK, N. Y.

INSULATING COMPOUND.

SPECIFICATION forming part Of Letters Patent NO. 426,202, dated April 22, 1890.

Application filed January 17, 1890- Serial No. 337,246. (No specimens.) A

To all whom it may concern.-

Be it known that 1, JAMES I MUNSIE, a

British subject, residing at Brooklyn, in'the IO to which it appertainsto make and use the same.

My mvention relates to a certain new a PM fire-proof, whereby it is especially appropriate '20 to many usesin connection with the electrical arts and particularly in connection with the construction of conduits or ducts for elecseveral ingredients of this preliminary bath should be two and one-half pounds of salt and three ounces each of sulphate of aluminum and sulphate of zinc 0 every ree ga ons of wa er. 1e so n 1011 after having acted upon the pulp is then drained oit and I an equal part, by weight, of finely-pulverized fire-clay and an equal part, by weight, of fi nelypu verlzed Portland cement are added to it, m

together with a sufiicient quantity of white glue and silicate of soda to agglutinate and com ine 1e W10 e. i n intimate homogeneous admixture of these constituent parts is secured by mechanical agitators or mixers. The mixture thus obtained is thereupon ilaced in molds and subjected to heavy pressure. 1 he molded articles are thereupon Thoroughly dried in a suitable oven, andwhile st ll hot are immersed ii a hot bath of lndia- 'nown comrubber or of fire-proof paint.

' merci |lyasn1nwra paint. Thehotliquid thereafter subjected to the ordinary vulcanizinj process.

e article made in accordance with the procedure described isof great strength and A. M. PARKINS.

useful compound or composition of matter is absorbed in large quantity y e e1 et adapted to be conveniently formed or molded mass 0 .ie article plunged into it, and any 15 under pressure into articles of suitable shape existing pores are filled, thereby rendering 1 having great strength and durability and the article thoroughly water-proof. In order having high insulating properties, while at (when rubber is employed) to render said the same time being both water-proof and rubber non-inflammable, the article may be trical conductors, insulating-linings forsuch compactness and of superior insulating propconduits, switch-boards, and the like. erties,besidesbeing composed of constituents 25 The basis of my improved compound conof comparatively moderate cost, and capable sists, primarily, of a paper-pulp, of wood or of ready manipulation. other fiber, rendered non-inflammable by suit- Having thus described my invention, What able treatment and mixed with refractory I claim is earthssuch asfire-clay and Portland cem- 1. A new composition of matter, consisting o ent-and with non-inflammable agglutinatof non-inflammable paper-pulp, refractory ing materialssuch as white glue and silicate earth, and a non-inflammable agglutinating of sodathe article after its formation from or binding agent, substantially as described. these ingredients being caused to absorb by 2. A new composition of matter, consisting immersing or otherwise a waterproofing comof paper-pulp, refractory earth, a non-inflam- 3 5 position. mable agglutinating or binding agent, and a In carrying my invention into effect I have non-inflammable waterproofing agent, subfound'it practicable to proceed as follows: I stantially as described. first take a a erill 01' ill) of wood or 3. A new composition of matter, consisting other fiber, and thoroughly wash or [5011 the of paper-pulp, fire-clay, Portland cement, 40 same in a solution of common salt sui )hate white glue, and silicate of soda, substantially o lllllm 7 sn late o 2110 mm e as described. en l'masso pulp is completely impregnated 4. A new composition of matter, consisting with said'solution. The proportions of the of paperpulp, fire-clay, Portland cement, 5 

